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The human skin contains microbes that reside either in or on the skin and can be residential or transient. Resident microorganism types vary in relation to skin type on the human body. A majority of microbes reside on superficial cells on the skin or prefer to associate with glands.
Human microbiota are microorganisms (bacteria, viruses, fungi and archaea) found in a specific environment. They can be found in the stomach, intestines, skin, genitals and other parts of the body. [1] Various body parts have diverse microorganisms. Some microbes are specific to certain body parts and others are associated with many microbiomes.
Microbes are essential tools in biology as model organisms and have been put to use in biological warfare and bioterrorism. Microbes are a vital component of fertile soil. In the human body, microorganisms make up the human microbiota, including the essential gut flora.
Though micro-animals can also live on the human body, they are typically excluded from this definition. In the context of genomics, the term human microbiome is sometimes used to refer to the collective genomes of resident microorganisms; [118] the term human metagenome has the same meaning. [117]
Composition and distribution of gut microbiota in human body. In humans, the gut microbiota has the highest numbers and species of bacteria compared to other areas of the body. [9] The approximate number of bacteria composing the gut microbiota is about 10 13 –10 14 (10,000 to 100,000 billion). [10]
Micro-animals which live on the human body are excluded. The human microbiome refers to their collective genomes. [15] Humans are colonized by many microorganisms; the traditional estimate was that humans live with ten times more non-human cells than human cells; more recent estimates have lowered this to 3:1 and even to about 1:1 by number (1: ...
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It can also inhibit the growth of Helicobacter pylori. [25] So important is its antimicrobial actions that it has been noted that "removing P. aeruginosa from the skin, through use of oral or topical antibiotics, may inversely allow for aberrant yeast colonization and infection." [3] Another aspect of bacteria is the generation of body odor.